[gameshot911]

Same thing as a bump key? Basically you cut down all the notches to the lowest setting (ie the deepest cut for that model of key), and then exactly as you described you put the key in up to the penultimate notch, at which point you apply rotational pressure on the key and knock the key in with some force (aka "bump" it in). The force of the insert bumps all the pins up, and the torque applied to the key catches the top half of the pin in the "open" position as the mechanism falls. If you catch all the top halves, the lock is breached.